Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/25/2001
Publication Date: 10/25/2001
Citation: OLNESS, A.E., GESCH, R.W., FORCELLA, F., ARCHER, D.W., RINKE, J.L. EFFECT OF VANADIUM ON DEVELOPMENT OF CHLOROSIS AND ROOT GROWTH OF CUPHEA. CD-ROM. MADISON, WI: ASA-CSSA-SSSA. 2001.
Technical Abstract: Cuphea seed contains oils that have commercial application. Little is known regarding its mineral nutritional requirements or responses to inhibiting elements. Oil seed crops often need additional phosphorus (P) to achieve optimal economic yield. Vanadium (V), a commonly occurring soil constituent, interferes with plant P uptake and V is a factor in lipid metabolism. A hydroponic growth chamber experiment was conducted to evaluate the effect of V:(V+P) molar ratios on cuphea growth and development. Relative root length, root surface area, root weight, and aerial dry weights decreased at a near exponential rate as the V:(V+P) ratio increased from 0 to 0.04. Additions of Mg to increase the Mg:(Mg+Ca) ratio further decreased plant growth by as much 50%. Root length decreased about 50% when cuphea was grown in 153 umolar V but relative root area and dry weight decreased by more than or equal to 75% of the control. Increases sin V concentration in the nutrient solution sharply reduced secondary and higher order lateral branching. Reduction in root growth was accompanied by a general chlorotic appearance. Seedling shoot growth (4 weeks) and root growth were closely correlated and nearly equal for all treatments. Poor root development often leads to susceptibility to drought stress with reduction in carbohydrate and oil contents in the seed and a greater degree of embryo abortion.